<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <meta http-equiv="X-UA-Compatible" content="ie=edge">
  <title>Document</title>
  <style>
    * {
      margin: 0;
      padding: 0;
    }

    img {
      width: 100%;
      height: 100%;
      display: block;
    }

    .box {
      width: 450px;

      margin: 50px;
      display: flex;
      flex-direction: column;

      position: relative;
    }

    .box>.show {
      width: 450px;
      height: 450px;
      border: 1px solid #333;
      position: relative;
    }

    .box>.show>.mask {
      width: 200px;
      height: 200px;
      background-color: yellow;
      opacity: .4;
      position: absolute;
      top: 0px;
      left: 0px;

      display: none;
    }

    .box>.list {
      width: 100%;
      flex: 1;

      display: flex;
      justify-content: flex-start;
      align-items: center;

      box-sizing: border-box;
      padding: 20px;
    }

    .box>.list>p {
      width: 54px;
      height: 54px;
      border: 1px solid #333;
      margin-right: 10px;
    }

    .box>.list>p.active {
      border-color: red;
    }

    .box>.enlarge {
      width: 400px;
      height: 400px;

      position: absolute;
      top: 0;
      left: 101%;

      background: url(./imgs/1.big.jpg) no-repeat;
      background-size: 800px 800px;
      background-position: 0 0;

      display: none;
    }
  </style>
</head>

<body>

  <div class="box">
    <div class="show">
      <img src="./imgs/1.jpg" alt="">
      <div class="mask"></div>
    </div>
    <div class="list">
      <p class="active">
        <img src="./imgs/1.small.jpg" showImg="./imgs/1.jpg" enlargeImg="./imgs/1.big.jpg" alt="">
      </p>
      <p>
        <img src="./imgs/2.small.jpg" showImg="./imgs/2.jpg" enlargeImg="./imgs/2.big.jpg" alt="">
      </p>
    </div>
    <div class="enlarge"></div>
  </div>
  <script src="./js/4enlarge.js"></script>
  <script>
    let showEle = document.querySelector(".show");
    // 获取遮罩层
    let maskEle = document.querySelector(".mask");
    // 获取 box元素
    let boxEle = document.querySelector(".box");
    // 获取放大镜区域元素
    let enlargeEle = document.querySelector(".enlarge");


    let smallImgEles = document.querySelectorAll(".list p");
    let showImg = showEle.querySelector("img");


    let enlarge = new Enlarge(showEle, maskEle, boxEle, enlargeEle,smallImgEles,showImg);
    // enlarge.switchImg();



  </script>


</body>

</html>